[fpc-pascal] Calling C++ object

[Josh.Bowden at csiro.au]

Hi,

I am trying to call a C++ object which is in a dll from a Pascal interface unit as described in Rudy's Delphi corner: (http://rvelthuis.de/articles/articles-cppobjs.html). I use the inheritance method, making my C++ object a descendent from a Virtual ancestor.

I end up with run time errors in both fpc and the cross 64 bit compiler (my desired target is Win64):

error 210, (=R6025 - pure virtual function call)

However, the code works using Delphi. All my functions in my Pascal interface are 'virtual; stdcall; abstract; so the error makes sense, except that it works in Delphi.

I am wondering what are differences between Delphi and FPC that will not let me call C++ objects from DLL's? Or is there a command line switch I have missed that may help?

I use:
ppcrossx64 program_name.pas -vi -Sg -Si -Mfpc -OpATHLON64 -XD -Xs -B  -Rintel -Mdelphi -TWin64 -Cr
Thanks for any help with this.

Josh.



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